Komatsu D155A-6 Operation & Maintenance Manual page 326

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MAINTENANCE
METHOD OF RELEASING PRESSURE IN HYDRAULIC CIRCUIT
1. Lower the work equipment to the ground.
2. Set the parking brake lever and work equipment lock lever to the LOCK position.
Carry out Steps 3 - 5 within 15 seconds.
When the engine is stopped, the pressure in the accumulator gradually goes down. For this reason, the check can
only be carried out immediately after the engine is stopped.
3. Stop the engine.
4. Turn the starting switch to the ON position (B).
5. Set the work equipment lock lever to the FREE position (F),
then operate the blade control lever and ripper control lever
fully to the front, rear, left, and right to release the pressure in
the hydraulic circuit.
6. Set the work equipment lock lever to the LOCK position and turn the starting switch to the OFF position.
SERVICE PROCEDURE
4 - 89

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